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The fridge section runs off of the freezer..
Set the freezer close to recommended factory setting.. If you want things a little colder - go a little higher - etc..
Set the fridge setting close to recommended factory setting..
If you want things a little colder - go a little higher - etc..

The recommended settings are usually pretty good and help the fridge run at peek performance..

Any change in settings will take at least 12 hours or more to take effect..

How old is this fridge? Your themostat may be shot. Put an accurate thermometer in the freezer and cooler to ge the real reading. If they are the same as on the door then the themostat is probably the problem. If not, it could be that all you need is a new display.

You should have 2 dials one is the thermostat when you set it all the way one direction it will shut you refrigerator off. Turn it back to about the middle if there are no numbers. The other dial is the air damper between the freezer and the refrigerator. The fan circulates the air through refrigerator by this damper. If you open this open to much your food in the refrigeration section will freeze. Close it back to about 2 that will give you a colder freezer and should be about right for the refrigeration section.

You may have a defrost problem. It could be either the defrost control itself or the defrost heater. You would have to look at your evaporator coil to see, if it is frozen solid. If the evaporator fan working? It should stop, when the freezer is in defrost. If it never starts, either the fan is broken or your defrost control is stuck.